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Taxation (Details) - Schedule of per share effect of the tax holiday - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Per Share Effect of the Tax Holiday [Abstract] |  |  |
Effect of tax holiday | $ 469 | $ 1,786 | $ 824
Per share effect – basic and diluted | $ 0 | $ (0.01) | $ 0

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- Definition Income loss net of tax per basic per share. + References No definition available. + Details
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Namespace Prefix: | ucl_
Data Type: | dtr:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Income tax reconciliation tax holidays reversal. + References No definition available. + Details
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Namespace Prefix: | ucl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeTaxHolidayLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration